/*
 * Copyright (c) 2012 Robert Burrell Donkin robertburrelldonkin.name
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
 * and associated documentation files (the "Software"), to deal in the Software without restriction, 
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software 
 * is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or 
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 */
package walrus.text;

public class EmptyWordCount implements WordCount {

	public static final EmptyWordCount INSTANCE = new EmptyWordCount();
	
	public void add(String word, int count) {
		throw new UnsupportedOperationException();
	}

	public void clear() {}

	public Walk descending() {
		return new EmptyWalk();
	}

	public void inc(String word) {
		throw new UnsupportedOperationException();
	}

	public void merge(WordCount wordCount) {
		throw new UnsupportedOperationException();
	}

	public int size() {
		return 0;
	}

	public Walk walk() {
		return new EmptyWalk();
	}

	public static final class EmptyWalk implements Walk {

		public int count() {
			return 0;
		}

		public boolean hasNext() {
			return false;
		}

		public String next() {
			return null;
		}

		public void remove() {
			throw new UnsupportedOperationException();
		}
		
	}
}
